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Discussion :: ohms-law

  1. A 120 V lamp-dimming circuit is controlled by a rheostat and protected from excessive current by a 3 A fuse. To what minimum resistance value can the rheostat be set without blowing the fuse? Assume a lamp resistance of 20 ohms.

    2. A.
    40
    B.
    4
    C.
    2
    D.
    20

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    Answer : Option D

    Explanation :

    No answer description available for this question.

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